The Munchkin Boiler

The Munchkin Boiler is one of the most compact and efficient residential boiler available on the market today. Each Munchkin Boiler will modulate its firing rate to match the energy needs of the living space. This feature provides additional savings versus traditional single firing heaters. With stainless steel construction, you can be assured that you are buying the highest quality appliance. Proven European technology, manufactured in the United States. A quiet operational appliance is just another benefit that comes with the Munchkin boiler.

How It Operates

When the room thermostat calls for heat, the Munchkin boiler control board will start the pump and start to monitor the return water temperature of the system before the heater will begin to heat the water. Once the controller has sensed a drop in the return water temperature below the temperature set point minus the differential set point, the Munchkin boiler will start to heat the water. This eliminates the boiler starting every time the thermostat calls for heat. This feature keeps the system from short cycling.

Once the system has sensed the temperature difference, the Munchkin boiler will activate the blower motor for 5 seconds to prepurge the system before starting the Munchkin boiler. The Munchkin boiler controller will now start to modulate the premix burner based on analyzing the return water temperature, supply water temperature, and the set point temperature. By compiling this information, the controller utilizes an algorithm to fully adjust the firing rate while maintaining the desired output temperature. The pre-mix burner fans have a low-voltage direct current drive motor with a pulse relay counting. This system allows precise control over the fan speed and combustion air volumes. Coupled with the Dungs gas valve and the Venturi system set to provide a one-to-one ratio of precisely measured volumes of fuel to air, accurate and instant burner output is achieved. This keeps the Munchkin boiler running at the highest efficiency. When the thermostat is satisfied, the Munchkin boiler will then go through a 4 second post-purge cycle before shutting off. Every Munchkin boiler is equipped with an indicator light which will pulse constantly in normal operation. When a problem occurs, the indicator light will blink slowly to indicate the heater fault.


  • Fully modulating for ultra high efficiency 95.1%
  • Consists of stainless steel construction 316L     
  • ASME And Vision One Control Now Standard
  • Direct vent with standard schedule 40 PVC    plastic pipe
  • Quiet operation
  • State-of-the-art control
  • Reliable field-proven spark ignition
  • Each unit is inspected for 100% quality satisfaction
  • Sealed combustion
  • Environmentally friendly
  • Modular component construction
  • 12 year limited warranty
  • Operates at low supply temperature

Burnham CHG tm Condensing Boilerslogo burnham
Burnham CHG condensing boilers achieve 94+% efficiency through the ruggedly designed heat exchanger. These sectional, cast aluminum designs use the heat in the exhaust gases from the boiler’s combustion process to preheat the water as it enters the boiler, thus capturing energy that otherwise would be lost. In addition, CHG boilers have fully modulating controls that allow the boiler to operate with up to a 5-to-1 turn down ratio. Thus a CHG boiler continuously adjusts its output to more efficiently and effectively provide the right amount of heat that helps conserve fuel and reduce heating costs.

CHG boilers come in two sizes and are available for either natural gas or propane installations. Each CHG boiler’s fully modulating control system has a variety of sensors including indoor/outdoor reset that are standard on each boiler and provide the input to the control system to maximize operating efficiencies.

Through its advanced design, packaging, and unique combustion process, a CHG boiler operates so quietly that it may not even be heard firing, but the sequence of operation is visible on the digital display mounted on top of the boiler.

  • 94+% AFUE - ENERGY STAR® Certified
  • Condensing Water Boiler
  • Natural or LP Gas 150 - 225 MBH (2 sizes)
  • Cast Aluminum Heat Exchanger
  • Direct Vent Sealed Combustion
  • Fully Modulating Firing Rates


Prior Lake Heating & Air Conditioning, LLC, Heating & Air Conditioning, Prior Lake, MN